EP 1039708 A1 20000927 - CIRCUIT FOR CAPTURING FRAME SYNC SIGNAL IN RECEIVER
Title (en)
CIRCUIT FOR CAPTURING FRAME SYNC SIGNAL IN RECEIVER
Title (de)
SCHALTUNG ZUM FANGEN EINES RAHMENSYNCHRONISIERSIGNALS IN EINEM EMPFÄNGER
Title (fr)
CIRCUIT D'ACQUISITION DE SIGNAL DE SYNCHRONISATION DE TRAME DANS UN RECEPTEUR
Publication
Application
Priority
- JP 9805615 W 19981211
- JP 36819097 A 19971229
Abstract (en)
I and Q symbol streams are demodulated from a received signal of a wave to be PSK-modulated in which BPSK-modulated frame-synchronizing signal and superframe-identifying signal respectively having a 20-symbol length and an 8PSK-modulated digital signal are time-multiplexed by a demodulating circuit (1). BPSK-demapped bit streams B0 to B3 are generated by a BSPK demapper (3) in accordance with criterion border lines obtained by rotating a basic BPSK criterion border line and a basic criterion border line whose received-signal points are the same as Q-axis on I-Q phase plane by pi /4, 2 pi /4, and 3 pi /4 counterclockwise. When a pattern having a difference of several bits at most from a frame-synchronizing signal is captured from B0 to B3 by first comparing circuits 60 to 63 and thereafter, a pattern having a difference of several bits at most from a superframe-identifying signal is captured by second comparing circuits 64 to 67 after a predetermined certain time, a frame-synchronizing-signal-capturing-signal generating circuit (90) outputs a frame-synchronizing-signal capturing signal (SYN). <IMAGE>
IPC 1-7
IPC 8 full level
H04J 3/06 (2006.01); H04L 27/22 (2006.01); H04L 7/04 (2006.01)
CPC (source: EP US)
H04L 7/042 (2013.01 - EP US); H04L 27/22 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 1039708 A1 20000927; EP 1039708 A4 20050511; EP 1039708 B1 20071121; CA 2316177 A1 19990708; CA 2316177 C 20080129; CN 1124009 C 20031008; CN 1283355 A 20010207; DE 1039708 T1 20010315; DE 69838759 D1 20080103; DE 69838759 T2 20081030; US 6625239 B1 20030923; WO 9934568 A1 19990708
DOCDB simple family (application)
EP 98959178 A 19981211; CA 2316177 A 19981211; CN 98812756 A 19981211; DE 69838759 T 19981211; DE 98959178 T 19981211; JP 9805615 W 19981211; US 58125900 A 20000627